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Passport Control: Biological Passports Explained
They are supposed to be the tool that levels the playing field between dopers and the authorities. However, Czech cyclist Roman Kreuziger is just the latest athlete to claim the anomolies with his passport's readings have an innocent explanation. So, just how effective are biological passports and what exactly do they do? The 麻豆社's Matt Slater answers these questions...
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On Your Bike - Stories of Cycling—Not by the Playbook
Stories from around the world of cycling and beyond